The minimum number of fibres required for a yarn cross section is

In a yarn manufacturing process, the cleaning index of a machine is defined as

Where D_F = the direct content of the feed material

D_D = the direct content of the delivered material.

The ratio of the fabric area covered by the yarn to the total fabric area is called

Among the following treatment process 90% of BOD of effluent can be reduced by

The fatigue resistance of cord fabric materials is high for

The pore radius of a filter by bubble point cannot be calculated using the parameter